Coating and coating method
The present invention discloses a coating for a medical implant, wherein at least a part of said coating contains an osseointegration agent and the same and/or a different part of the coating contains an antimicrobial metal agent.
1. A medical implant comprising an implant surface having a surface coating comprising a silver-substituted osseointegration agent, and an antimicrobial metal agent present in discrete particles and at a concentration sufficient to have an anti-bacterial effect, wherein the silver-substituted osseointegration agent has a silver concentration homogeneously distributed throughout the surface coating, and wherein the antimicrobial metal agent present in discrete particles is distributed in the coating and comprises silver.
2. The medical implant of claim 1 , wherein the antimicrobial metal agent in the surface coating is present at about 0.1 to about 10 weight percent.
3. The medical implant of claim 1 , wherein the discrete particles comprise metallic silver or a silver compound.
4. The medical implant of claim 1 , wherein the discrete particles are discrete metallic silver particles.
5. The medical implant of claim 4 , wherein the metallic silver particles are spherical or irregular in shape.
6. The medical implant of claim 5 , wherein the diameter of the metallic silver particles is about 15 nm to about 10 μM.
7. The medical implant of claim 1 , wherein the silver-substituted osseointegration agent contains about 0.1 to about 10% by weight of silver.
8. The medical implant of claim 1 , wherein the silver-substituted osseointegration agent contains about 0.5 to about 3.0% by weight of silver.
9. The medical implant of claim 1 , wherein the osseointegration agent is a calcium derivative.
10. The medical implant of claim 9 , wherein the osseointegration agent is hydroxyapatite, β-tricalcium phosphate, or a mixture of both.
11. The medical implant of claim 1 , wherein the thickness of the surface coating is about 1 μm.
12. The medical implant of claim 1 , wherein the thickness of the surface coating is about 10 μm to about 200 μm.
13. The medical implant of claim 1 , wherein the thickness of the surface coating is about 30 μm to about 100 μm.
14. The medical implant of claim 1 , wherein the tensile attachment strength of the surface coating to the implant surface is equal to or greater than 15 MPa.
15. The medical implant of claim 1 , wherein the surface coating further has osteoinductive, or osteopromotive properties.
16. The medical implant of claim 1 , wherein the homogenously distributed silver concentration comprises a concentration of from about 0.5 to about 3.0 percent by weight throughout the surface coating.